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Show 106 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Mar. 6, Little Minch. 1870 : Atl. 24, 25, off C. Sagres, 26-30, Tangier B.; Med. Capo diGaeta,45, Cartagena B., 50, Benzert Road, Adventure Bank, off Rinaldo's Chair. Distribution. Drontbeim to the Mgeaxi and Sea of Marmara, 0. Verde I. (de Rochebrune); 2-205 fms. Fossil. Miocene: Vienna Basin and Touraine ? Pliocene: English and Belgian Crags, S. France, and Italy. Post-tertiary: Norway, W . Scotland, and Nice; 0-50 ft. There are several synonyms, including T. granulatus of de Blainville (not Born), and T. millegranus of Philippi, who in Kiister's edition of Martini and Chemnitz gave not only the latter but also T. miliaris as recent species, separated from each other by many pages and plates. Some specimens or varieties differ greatly in size, or they have a higher spire and are more pyramidal; others are more finely and closely sculptured; others have quite a flattened base, while one specimen has a rounded base and no keel. In a small coarsely granulated variety the apex is twisted, and might easily be taken for a distinct species. The colour is occasionally milk-white. The fossil type or progenitor of the species is much more conical and smaller than the living species. The specific name miliaris is not appropriate, if it has reference to millet-seed; and it is not a Latin word. 31. TROCHUS GRANULATUS, Born. T. granulatus, Born, Ind. Mus. Cses. Vind. 1778, p. 343: B. C. iii. p. 327 ; v. p. 204, pi. lxiii. f. 5. 'Porcupine' Exp. 1869: St. 1, 45 a, 45 b. 1870: Atl. offC Sagres ; Med. Capo di Gaeta, 50, off Jijeli, 55, Benzert Road, Rasel Amoush, G. Tunis, Adventure Bank. Distribution. British Isles, Normandy, Mediterranean, Adriatic, Mogador, Madeira, Canaries; 2-145 fms. Fossil. Pliocene : Red and Norwich Crags, Italy, Morea, Rhodes. Post-tertiary : Ireland. T. papillosus, Da Costa, 1778 (not S. Wood), T. fragilis, Pulteney (not Gmelin), T. tenuis, Montagu. Variable in sculpture, which is more or less closely beaded; the spiral striae on the lower whorls are sometimes quite smooth. The • Porcupine ' specimens which I had considered T. multigranus of S. Wood I now believe to be merely the present species having larger and fewer beads or tubercles. The very young shells are deeply umbilicate. 32. TROCHUS ZIZYPHINUS, Linii6. T. zizyphinus, L. S. N. p. 1231 : B. C. iii. p. 330, pi. vii. f. 4 ; v. p. 204, pi. lxiii. f. 6. ' Lightning' Exp. St. 4,5. ' Porcupine' Exp. 1869 : Lough Foyle,Little Minch. 1870 : Atl. Vigo, 25, Tangier B., Gibraltar B.,* Med. Benzert Road (var. conulus), Rasel Amoush. |